Identification of the mechanical performance of finger-jointed laminated merbau timber beams reinforced with carbon fiber reinforced polymer (CFRP)

Nurhayati, Lilis and Dewi, Sri Murni and Wisnumurti, Wisnumurti and Nuralinah, Devi (2025) Identification of the mechanical performance of finger-jointed laminated merbau timber beams reinforced with carbon fiber reinforced polymer (CFRP). Eastern-European Journal of Enterprise Technologies, 6 (7). pp. 30-44. ISSN 1729-3774

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Abstract

In this research, the mechanical properties and the reinforcement mechanism of finger-jointed laminated Merbau beams processed from wood-industry wastes are investigated and unreinforced specimens and exter nally U-shaped carbon fiber reinforced polymer (CFRP) strengthened beams are compared. The problem to be solved is the brittle failure and reduced flexural capaci ty of finger-jointed glulam; hence, it determines the com bined impact of joint orientation (face-finger and face butt), the number of lamination (three and five layers), and CFRP reinforcement on block-assembled beams with randomly distributed finger joints through four point bending tests. The outcome of the study reveals that the use of CFRP has a huge impact on the flexur al performance of the material, with the ultimate load being increased by 27.4–48.8% and the maximum bending moment being raised by 45.3% when compared to non-re inforced beams. The mid-point deflection at the maxi mum load has also increased by 6.5–51.4%, which shows a higher capacity for deformation and better ductility of the material. The noted enhancements are credited to the success ful shifting of the stress from the timber tension zone to the CFRP, lessening of stress concentration at the finger joint discontinuities, and the crack initiation and prop agation taking longer time in random locations which together change the structural response from sudden brit tle fracture to more stable damage progression leading up to failure. Among the tested configurations, face-butt beams have obtained the highest modulus of elasticity of 20.46 GPa (an 8.8% increase), while the five-lamina face butt configuration strengthened by CFRP has reached the greatest modulus of rupture of 55.85 MPa (a 33.4% increase). The three-lamina face-finger beams showed the highest increase of MOR after reinforcement, being at 48.30 MPa (a 46.4% increase). Changing lamination from three to five layers raised flexural strength by 18.9%, sug gesting a homogenization effect that improves stress dis tribution in laminated beams composed of blocks. All in all, the collaboration of finger-joint configuration, num ber of lamination, random block assembly, and CFRP strengthening has opened a door to convert Merbau wood waste into higher-performance engineered timber elements for low-carbon structural applications

Item Type:	Article
Uncontrolled Keywords:	merbau, glulam, beams, CFRP, reinforce ment, bending, mechanical performance, MOE, MOR
Subjects:	H Social Sciences > HD Industries. Land use. Labor > HD28 Management. Industrial Management T Technology > T Technology (General)
Divisions:	Fakultas Teknik > Prodi Teknik Industri
Depositing User:	Lilis Nurhayati
Date Deposited:	27 Feb 2026 03:51
Last Modified:	27 Feb 2026 03:51
URI:	http://repositori.ukdc.ac.id/id/eprint/2577

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